Sharks are apex predators that have no natural enemies; however, humans are predators of sharks, with an estimated 30 to 100 million sharks are killed every year by fisherman. This has caused many species of sharks to be... More »

Seals protect themselves by using their sensitive ears to let them know when they should swim away from danger, and by using their sharp teeth and strong jaws to defend themselves if they need to fight. A seal's streamli... More »

Sharks defend themselves by utilizing their natural abilities, including their intelligence, heightened senses and strength. Another effective defense ability is their speed, as sharks are fast swimmers. More »

Though sharks are considered apex predators, they are often eaten by humans and are sometimes eaten by killer whales. Shark embryos from different fathers will also eat each other in utero, with the largest embryo of the... More »

Cookiecutter sharks, also known as cigar sharks, are unusual, small predators that commonly attack much larger prey. Their upper and lower teeth are quite different, with the hook-like upper teeth being much smaller than... More »

www.reference.com Pets & Animals Marine Life Sharks

Over the years, experts have been trying to determine exactly why great white sharks attack humans. Three of the main theories include the investigatory theory, mistaken identity theory and social-defensive theory. More »

Male sharks are referred to as bulls or simply as males. Female sharks are only referred to as females, and the offspring of sharks are called pups. More »